Pattern matching - how to match on a number greater than or less than X

Questions
1

In the example list belowe how should I construct the pattern matching to remove any item where position 4 is greater than 20000?

listX = {{m,b,24,14000},{f,b,29,14000},{m,w,72,67000},{m,b,45,84000},{m,w,67,17000},{f,w,54,4000}};

I thought it would be something like DeleteCases[listX,{_,_,_,x_>20000}] but that doesn’t work. Does pattern matching only work on exact matches only?

Thanks for your help - greatly appreciated!

2

Try:

DeleteCases[listX, {_, _, _, x_} /; x > 20000]

I think you have to match the pattern, then test it.

3

Worked perfectly!

Thanks for your help!